Some time when we are typing, we can not see some keys on keyboard. they are missing or some particular keys are not functioning. It means external keyboard is not working..
So no need to worry here we have a trick for you .. 
You can use an internal keyboard on showing on screen and can type any key by mouse. For this process you just need to follow these steps

Step 1
Click window and select ''Run'' ..

Step 2
type "osk" without comas and press enter











You will instantly see a keyboard on your screen. You can use it by mouse clicking on keys






You can scroll it where you want..